The oxygen concentration sensor is equipped with a heater that maintains the temperature of the sensor within a certain range when the engine is running in all operating modes. Maintaining a certain temperature of the sensor allows the system to start up and idle faster.
1. Disconnect the connector from the oxygen concentration sensor and connect the special tool to the sensor connector (test lead harness) (pic. 6.28).
Pic. 6.28. Location of the oxygen concentration sensor
2. Verify that the circuit is closed between pin 1 (test lead harness red clip) and pin 3 (blue clip on test harness) oxygen sensor connector (the resistance between the contacts is 11-18 ohms at a temperature of 20°C) (pic. 6.29).
Pic. 6.29. Check of conductivity between contacts of a socket of the gauge of concentration of oxygen
3. If there is no continuity, replace the oxygen concentration sensor.
4. Start and warm up the engine to a temperature of more than 80°C.
5. Wires with crocodile clips connect pin 1 of the connector (red clip) with the positive terminal of the battery, and pin 3 of the connector (clip blue) with negative battery terminal (pic. 6.30).
Pic. 6.30. Using connecting wires to test the oxygen concentration sensor
Warning. Be very careful when connecting the wires to the battery terminals, as if the wires are connected incorrectly, the oxygen concentration sensor may be damaged.
6. Connect a digital voltmeter to pins 2 (clip black) and 4 (clip white) and by changing the engine speed, measure the output voltage of the oxygen concentration sensor.
Oxygen concentration sensor output voltage: 0.6-1.0V
8. If the output voltage of the sensor is different from the required one, replace the sensor.